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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2022 Raul Ferreira Fuentes <raul@nextcloud.com>
*
* @author Raul Ferreira Fuentes <raul@nextcloud.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Text\Service;
class EncodingService {
public const COMMON_ENCODINGS = ['UTF-8', 'GB2312', 'GBK', 'BIG-5', 'SJIS-win', 'EUC-JP', 'Windows-1252', 'ISO-8859-15', 'ISO-8859-1', 'ASCII'];
public const UTF_BOMs = [
'UTF-32BE' => "\x00\x00\xfe\xff",
'UTF-32LE' => "\xff\xfe\x00\x00",
'UTF-16BE' => "\xfe\xff",
'UTF-16LE' => "\xff\xfe",
'UTF-8' => "\xef\xbb\xbf"
];
public function encodeToUtf8(string $string): ?string {
$encoding = $this->detectEncoding($string);
if (!$encoding) {
return null;
}
return mb_convert_encoding($string, 'UTF-8', $encoding);
}
public function detectEncoding(string $string): ?string {
$bom_detect = $this->detectUtfBom($string);
if ($bom_detect) {
return $bom_detect;
}
$encodings = $this->getEncodings();
foreach ($encodings as $encoding) {
if (mb_check_encoding($string, $encoding)) {
return $encoding;
}
}
return null;
}
public function detectUtfBom(string $string): ?string {
foreach (self::UTF_BOMs as $encoding => $utf_bom) {
$bom = substr($string, 0, strlen($utf_bom));
if ($bom === $utf_bom) {
return $encoding;
}
}
return null;
}
/**
* @return string[]
*/
private function getEncodings(): array {
$mb_order = mb_detect_order() ?: [];
return array_merge($mb_order, self::COMMON_ENCODINGS);
}
}
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